Value Sources (API, Oracle)

set_collection_value_source(...): Assigns an API endpoint or oracle address as the value source.

When is_api_source = true, metadata or NFT values may depend on data fetched from this endpoint.

When is_api_source = false, the source is considered an oracle address providing on-chain data feeds.

This feature enables dynamic NFTs that can reflect external states or real-world conditions.

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